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Urinary stones (calculi) are a common problem in young, castrated male sheep and goats. If the stone actually causes the urinary bladder or urethra to rupture, this problem is often called "water belly" because of the accumulation of urine in the abdomen. Stones can also form in the female but very rarely cause a problem because of the large size of the urethra. Males that are castrated at a very young age have a much smaller penis and urethra, leading to easier blockage of the urethra by small stones. The disease occasionally affects breeding rams or bucks. The stones usually lodge in either the sigmoid flexure, a large "s" shaped curve of the penis just behind the scrotum; or in the urethral process, which is an extension of the urethra that protrudes several centimeters beyond the end of the penis.

Information from infovets.com
This page was last updated on: January 18, 2008
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This ram has a stone blockage of his urethra. Notice the marked swelling in the belly and sheath.
Photo from: Gates' Practical Guide to Sheep Disease Management